str1="hellp world"
str2='hello world'
str3="""hello world"""

print(str1)
print(str2)
print(str3)
print('hel\'l o world')
print('123--{0}--{1}--{2}'.format(4,5,6))
str1='hello'
print(f'123---{str1}')

for i in range(0,101,2):
    print("------------开始下载--------------")
    if i==100:
        print("下载完成")
    else:
        # print(f'{i}%','[',"*"*(i//2),","*((100-i)//2)']')
        str4="*"*(i//2)+"."*((100-i)//2)
        print(f'{i}%[{str4}]')